Capture The Flag 101 Workshops
Here you can get the materials for CTF101 workshops. These workshops are free to attend at SecTalks meetups
CTF101 - 04 Android Hacking
Introduction to Android hacking and APK reversing
CTF101 - 03 Intro to Binary Exploitation
Introduction to binary exploitation and reverse engineering
CTF101 - 02 Cryptanalysis
A taste of Cryptanalysis
CTF101 - 01 The basics
A taste of CTF